The first Pi Day was celebrated at the San Francisco Exploratorium in 1988.
“On the first π Day, at 1:59, Larry and his wife, Catherine, set up a table on the museum's floor topped with fruit pies and a tea urn for the celebration.”
https://www.exploratorium.edu/pi-day/pi-day-history?media_utm_source=butts #PiDay #SanFranciaco